<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
</head>
<style>
    *{
        padding: 0;
        margin:0
    }
    header{
        width: 100%;
        height: 100px;
        background: red;
        position: absolute;
        top: 0;
    }
    footer{
        width:100%;
        height: 100px;
        background: black;
        position: absolute;
        bottom: 0;
        
    }
    .content{
        width: 100%;
        height: 300px;
        background: skyblue;
        padding-top:100px;
    }
    .content .left{
        width: 500px;
        height: 300px;
        position: absolute;
        background-color:#fff;
        left:0;
        
    }
    .content .right{
        width: 500px;
        height: 300px;
        background-color: green;
        position: absolute;
        right: 0;
    }
    .t{
        margin-left: 100px;
    }
    .left nav ul li {
        float: left;
        margin-left: 10px;
        list-style: none;
    }
</style>
<body>
    <header></header>
    <section class="content">
        <section class="left">
            <nav>
                <ul>
                    <li><a>首页</a></li>
                    <li><a>瓷业</a></li>
                    <li><a>山青院</a></li>
                    <li><a>我</a></li>
                    <li><a>尼</a></li>
                </ul>
            </nav>
        </section>
        <section class="right">
            <p>Doctype  声明位于HTML文档的第一行，处于<html>标签之前，告知浏览器使用什么
                    文档标准解析这个文档。DOCTYPE不存在或格式不正确会导致文档及兼容模式呈现</p>
        </section>
    </section>
    <footer></footer>
    <!-- mark  标记标签 -->
    <p>我在哪我是谁</p>
    <p>我在哪<mark>我是谁</mark></p> 
    <details class="t">
        <summary>你是谁</summary>
        <p>不知道</p>
        <p>知道</p>
        <p>不知道</p>
        <p>知道</p>
    </details>
    <input type="text" list="start">
    <datalist id="start">
        <option value="陈钰琪">陈钰琪</option>
        <option value="范冰冰">范冰冰</option>
        <option value="李连杰">李连杰</option>
    </datalist> 
    <progress value="25" max="100"></progress>
    <meter value="60" min="25" max="100" low="20" high="80"></meter>
</body>
</html>